Anyone familiar with watercooling knows DangerDen; they've brought us some of the most popular products in the industry including the award winning Maze series. The first watercooling block I used was a Maze and I've had a couple since. They've always been among the best performing blocks available at any time. Today we're going to be looking at their new reservoir and their very popular D4 pump. The reservoir is based on the popular bay reservoir style but ads a new material to the mix.